Grain yield performance of rice genotypes at suboptimal levels of soil N as affected by N uptake and utilization efficiency

Tirol‐Padre, Agnes; Ladha, J. K.; Singh, Upendra; Laureles, E.V.; Punzalan, Gloria C.; Akita, Shigemi

doi:10.1016/0378-4290(95)00095-x

Cited by 100 publications

(69 citation statements)

References 17 publications

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“…Low grain N concentration (Ng%) was also associated with high NUE g (Tirol-Padre et al 1996;Singh et al 1998;Inthapanya et al 2000;Koutroubas and Ntanos 2003). Grain N concentration decreases by about 0.1% as NUE g increases by 7 to 10 kg kg -1 as grain N concentration decreases by about 0.1% (Tirol-Padre et al 1996;Koutroubas and Ntanos 2003). Genotypes with high HI were more efficient in N use (Inthapanya et al 2000).…”

Section: Plant Traits Related To Nitrogen Use Efficiencymentioning

confidence: 90%

“…Genotypes with higher NUE g had a lower percentage of straw N (Ns%) at maturity (Tirol-Padre et al 1996;Singh et al 1998;Koutroubas and Ntanos 2003). Low grain N concentration (Ng%) was also associated with high NUE g (Tirol-Padre et al 1996;Singh et al 1998;Inthapanya et al 2000;Koutroubas and Ntanos 2003).…”

Section: Plant Traits Related To Nitrogen Use Efficiencymentioning

confidence: 96%

“…However, determination of NPI requires field evaluation of genotypes at low N (or zero fertilizer-N input) and high N levels. The high N level should not be too high to induce lodging, pest and disease damages, which affect the crop N response and NUE (Tirol-Padre et al 1996;Singh et al 1998). …”

Section: Plant Traits Related To Nitrogen Use Efficiencymentioning

confidence: 99%

“…WP/TN was well correlated with other NUE-related parameters and provided genotypic rankings that did not differ greatly from multiple-parameter rankings. Tirol-Padre et al (1996) compared NUE g of 180 genotypes without fertilizer N application. There were significant differences in NUE g among the 180 genotypes, ranging from 38 to 82 kg kg -1 .…”

Section: Genotypic Variation In Nitrogen Use Efficiencymentioning

confidence: 99%

“…Genotypic variation in Ng% is relatively small compared to the variation caused by management practices. Tirol-Padre et al (1996) studied genotypic variation in Ng% of 180 lines grown without fertilizer-N input. About 93% of genotypes had Ng% of 0.95 to 1.20.…”

Section: Plant Traits Related To Nitrogen Use Efficiencymentioning

confidence: 99%

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Prospects for Genetic Improvement to Increase Lowland Rice Yields with Less Water and Nitrogen

Peng¹,

Bouman²

Scale and Complexity in Plant Systems Research

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Abstract. Increasing yield potential of lowland rice remains to be the top priority in rice geneticimprovement programmes, because rice farmers' primary concern is still grain yield and world rice production has to increase by 1% annually in the next 20 years to meet the demand of the growing population. Improvements in yield potential of irrigated lowland rice were achieved under ample supply of water and nutrients. Water use efficiency (WUE) and nitrogen use efficiency (NUE) were seldom included in the breeding objectives for irrigated lowland rice. Scarcity of freshwater resources has threatened the production of the flood-irrigated rice crop, and excessive use of N fertilizer is causing environmental concerns. We have to increase lowland rice yield with less water and N. Newly developed crop management strategies have proven to be effective in increasing WUE and NUE. Several watersaving technologies such as alternate wetting and drying (AWD) and aerobic rice system have been developed to increase the water productivity of rice. However, yield penalty occurred when these watersaving technologies were practised with current varieties. New varieties have to be developed to reduce the yield loss under AWD and aerobic rice system in order to increase WUE further. Direct selection for WUE under flood-irrigated lowland conditions may have a negative impact on grain yield under watersaving strategies. Optimizing the timing and rate of N application to synchronize supply and demand of N by the crop has resulted in a great reduction in fertilizer-N input without yield loss and greater NUE. Genetic improvement of NUE has not been achieved in rice. Genotypic variation in NUE has been reported in many studies. Plant traits that are associated with high grain yield and high NUE should be identified so that breeders are able to use these traits easily as selection criteria in the breeding programme to develop N-efficient varieties without sacrificing rice yield potential. New breeding techniques such as development of F 1 hybrids, marker-aided selection, transformation and genetic engineering should be combined effectively with the empirical breeding method in order to increase rice grain yield with less water and N.

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Section: Plant Traits Related To Nitrogen Use Efficiencymentioning

confidence: 90%

Section: Plant Traits Related To Nitrogen Use Efficiencymentioning

confidence: 96%

Section: Plant Traits Related To Nitrogen Use Efficiencymentioning

confidence: 99%

Section: Genotypic Variation In Nitrogen Use Efficiencymentioning

confidence: 99%

Section: Plant Traits Related To Nitrogen Use Efficiencymentioning

confidence: 99%

See 3 more Smart Citations

Prospects for Genetic Improvement to Increase Lowland Rice Yields with Less Water and Nitrogen

Peng¹,

Bouman²

Scale and Complexity in Plant Systems Research

View full text Add to dashboard Cite

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Crop Improvement for Nitrogen Use Efficiency in Irrigated Lowland Rice

Peng

2011

The Molecular and Physiological Basis of Nutrient Use Efficiency in Crops

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There is an urgent need to develop superior nitrogen -effi cient rice varieties because of poor fertilizer nitrogen use effi ciency (NUE), associated economic and environmental concerns, and the lack of adoption of improved nitrogen management practices. Genotypic variation in NUE has been reported for rice in many studies. The physiological mechanisms underlying both nitrogen uptake effi ciency and utilization effi ciency are fairly well understood. Plant traits that are closely associated with NUE have been identifi ed. In general, there is a positive relationship between grain yield and NUE, suggesting that it is possible to develop rice varieties with both high grain yield and high NUE. An empirical breeding method can be used for developing nitrogeneffi cient varieties using existing genotypic variation in NUE. However, for signifi cant improvement in NUE, new breeding techniques such as the development of F 1 hybrids, marker -aided selection, transformation, and genetic engineering should be considered.

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Optimizing Canopy Physiology Traits to Improve the Nutrient Utilization Efficiency of Crops

Foulkes

Murchie

2011

The Molecular and Physiological Basis of Nutrient Use Efficiency in Crops

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Grain yield performance of rice genotypes at suboptimal levels of soil N as affected by N uptake and utilization efficiency

Cited by 100 publications

References 17 publications

Prospects for Genetic Improvement to Increase Lowland Rice Yields with Less Water and Nitrogen

Prospects for Genetic Improvement to Increase Lowland Rice Yields with Less Water and Nitrogen

Crop Improvement for Nitrogen Use Efficiency in Irrigated Lowland Rice

Optimizing Canopy Physiology Traits to Improve the Nutrient Utilization Efficiency of Crops

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